Truly sounds like a frog! Available in 5 sizes.

A wooden frog with a ridge up its spine! Hold him by the feet, make a resonating chamber with your hand cupped underneath, run the large end of the beater over its spine and listen for the croak!
Available in five sizes: 3″, 4″, 5″, 6″, & 8″. The larger the frog, the lower the tone.